Collapsible core



F. MEYER.

Y coLLAPslBLE com.

A P P L l C A T l 0 N F l L E D F E B I 7 1 9 2 0.

,398,236. Patented Nov. 29, 1921.`

me/who@ @$11k 'his u1 'ederwk Mayen entre Wg COLLAPSIB'LE CORE retrasan.

Specification of Letters Patent. i `pltilbll NDV- 29, 1.921.

Application filed `lebmlary 17, 1920. Serial` No. 359,219.

To all whom t may concern:

'Be it known that 1, FREDERICK MEYER, a citizen ofthe United States,andfresiding at East Northport, Long Island, in the county of Suffolkand State of New York, have invented certain new and useful improvementsin Collapsible Cores, of which `the following is a specication, such aswill enablethose skilled in the art to which it appertains to make anduse the same.

rlhis invention relates to collapsible cores for use in concreteconstructions of various kinds and classes, and particularly in theformation of bricks or blocks of concrete or similar material andproviding `the same with vertical, transverse or other bores or passagespreferably of cylindrical form in cross section, and theobject of theinvention is to provide a collapsible core of the class and for the1purpose specified lwhich `by reason of its construction will be strongand durable and may be quickly and easily detached from a concrete blockor other body after said body has been 4formed or cast therearound, whensaid body has become hard or set; and with this and other objects inview the invention consists in a device of the class and for the purposespecified, constructed as hereinafter described and claimed. n

The invention is ,fully disclosed in the following specification, ofwhich the accompanying drawing forms a part, in which the separate partsofmy improvement are designated by suitable reference characters in eachof the views, and in which Figure 1 is a central longitudinal sectionthrough a part of a concrete body or wall showing my improved core inconnection therewith and indicating the method of its use;

F ig. 2 a transverse section on the line 2-2 of Fig. l;

Fig. 3 a view similar to Fig. 2 with part of the construction omittedand indicating the method of detaching the core from the concrete bodyor wall; and,

Fig. 4L an edge View of one of a number of reinforcing and locking linkswhich I employ.

In the practice of my invention, I provide a collapsible core 5 which,in the form of construction shown, is tubular in form and is fashionedfrom sheet metal of predetermined length and width and of the desiredthicknessor/gag'e. One side portion V6 of the `sheet from `which thecollapsiblecore is formed,l is fashioned into a tubular bead 7 whichextends the full length ofthe sheet as shown inF ig. 1, and said ysheetis provided where the bead 'Zjoins the side portion 6 with an offset orshoulder portion 8 in which the other side edge `9 of the sheet lits, asclearly shown in Fig. 2. rihis construction or connection ofthe'separate side portions 6 and 9 of the sheet forms a continuousandunobstructed outer face on the core 5.`

I also employ in connection with core 5,

or the tubejof which said core is composed,

two reinforcing ring members 10, one of which is shown in detail in Fig.e. rThe ring members 10 consist of acircular body member 11 having acentral aperture 12, and provided `at their outer, edges `with ianges 13which project at right angles lto the said ring members; yand theiianges 13 andthe body members 11 are cut out to form recesses 11i toreceive the bead 7 when said ring membersare placed inthe core 5, or inposition for use.

The ring membersy 10 are employed in connection with the end portions ofthe core 5 and are inserted into the core with the fianges 13 thereofdirectedy inwardly as shown in F ig.1,andserve to reinforce said endportions ofthe core and also serve to lock the core in position and toprevent the side edge portions 6 and 9 thereof 'from collapsing underpressure in the use of the device. The apertures 12 in the ring members10 are provided to .permit of the placement of said members in the core5 and the detachment of said members therefrom whenever desired.

n the use of my improved core the same is mounted in the usual mold orframework 15 shown in Fig. 1 to form the desired concrete body with theopposite end portions thereof projecting through said framework as shownat 16. 1t will be understood that the ring members 1() will be placed inposition as shown in Fig. 1 prior to the pouring of the concrete` intothe mold or framework 15, and after the concrete body Vhas been formedand the cement or other mixture hardened, the core 5 is removed by firstwithdrawing the ring` members 10 and then applying a suitable tool tothe tubular bead 7 to force the side edge portion 6 of the core inwardlyas shown in Fig. 3 thus permitting of the withdrawal of said core fromthe concrete body 17.

It will be understood that the core 5 will be composed of springmaterial and will normally assume the position shown in Figs. 1 and 2 byreason of its. spring qualities, and by means thereof concrete orsimilar building blocks may be provided in the formation thereof withvertical, transverse or other bores or passages, in a simple andefficient manner. Y

. Having fully described my invention, what I claim as new and desire tosecure by Letters fatent, is

1. .A collapsible core for use in constructing concrete bodies and thelike, said core comprising an open tube composed of spring material, oneof the free side edge portions of said core being provided with aninwardly directed bead, a shoulder in connection with which the otherside edge portion of the core operates to form a continuous core whichis normally closed by the spring qualities thereof, and ring membersadapted to operate within the core at the end portions thereof, saidring members being cut out to receive said beadand serving to lock theside portions of the core against inward movement. Y

2. A collapsible core for use in forming concrete bodies and the like,said core comprising a tube made of spring material and open at oneside, one of the free side edges of said tube being provided with aninwardly directed bead, at the back of which-is a longitudinal shoulderin connection with which the other side edge portion of the tubeoperates when the core is in use, whereby said core is provided on itsouter side with a continuous, smooth and unobstructed surface, andreinforcing ring members adapted to be inserted within the opposite endportions of the core; and being provided with recesses in theirperimeters to receive said bead and serving to lock the side portions ofthe core against inward movement when the device is in use.

3. A collapsible core for use in constructing concrete bodies andthelike, said core comprising a tube of spring material open at one side,and one side edge portion of which is provided with an inwardly directedtubular bead at the back of which is a longitudinal shoulder, inconnection with which the other side edge portion of the tube operates,and reinforcing end members adapted to be inserted into the opposite endportions of said core and comprising circular body portions providedwith central apertures, and also provided at their perimeters withannular flanges which project at right angles thereto. d

4c. A collapsible core of the class described, consisting of a. springmetal tube open at one side and one side edge portion of which isprovided with an inwardly directed bead at the back of which is alongitudinal shouldert

